enable redis array options

in order to properly configure redis arrays, enable pass-through of array
options
incorporate feedback from tedivm

 - move the "redisArrayOptionNames" to a class attribute
adds tests for RedisArray options

In order to test whether RedisArray options are correctly passed, use
uopz extension which allows to stub the constructor of PHP objects so we
can test the parameter passing without dependency-injection and factory
hell. It also keeps the API compatible because otherwise we would have
to pass e. g. factory.
Merge pull request #172 from Jimdo/make_redis_array_options_available_in_stash_against_master

Make redis array options available in stash